Fix module-level store init in files.js, apiError.js, cytoscapeMap.js and add files store tests

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/module/cytoscapeMap.js

@@ -10,7 +10,6 @@ import { getTimeLabel } from '@/module/timeLabel.js'; // 時間格式轉換器
 import CytoscapeStore from '@/stores/cytoscapeStore';
 import { SAVE_KEY_NAME } from '@/constants/constants.js';
 
-const mapPathStore = MapPathStore();
 const composeFreqTypeText = (baseText, dataLayerOption, optionValue) => { //sonar-qube
   let text = baseText;
   const textInt = dataLayerOption === 'rel_freq' ? baseText + optionValue * 100 + "%" : baseText + optionValue;
@@ -233,12 +232,12 @@ export default function cytoscapeMap(mapData, dataLayerType, dataLayerOption, cu
 
   // 按下節點光暈效果與鄰邊光暈效果
   cy.on('tap, mousedown', 'node', function (event) {
-    mapPathStore.onNodeClickHighlightEdges(event.target);
+    MapPathStore().onNodeClickHighlightEdges(event.target);
   });
 
   // 按下線段光暈效果與兩端點光暈效果
   cy.on('tap, mousedown', 'edge', function (event) {
-    mapPathStore.onEdgeClickHighlightNodes(event.target);
+    MapPathStore().onEdgeClickHighlightNodes(event.target);
   });
 
   // creat tippy.js